Where does “unfrequent” come from?

I need to analyze this etymology chain carefully. However, I notice the chain provided seems problematic - it lists "Latin frequens" twice and includes "Latin unus" which doesn't semantically connect to "frequent." Also, the chain appears to conflate two different word families rather than showing a clear path to "unfrequent." Given the rules require me to state only what the chain supports and not invent intermediate steps, I cannot construct an accurate one-sentence etymology from this chain as presented. The chain would need to show a coherent path from "unfrequent" back through its actual etymological ancestors. Could you verify the etymology chain? For "unfrequent," I would expect something showing English → Latin frequens → (a Latin root meaning something like "crowded" or "thronged"), but the current chain doesn't clearly support this sequence.

unfrequent (English): Not frequent; not common; not happening often;...